"Do people seriously believe that politicians should be held to account for the behaviour of their parents, wives, children or kittens?"
I don't think it's their behaviour that you were being asked about. Be that is it may, I have a different question. You were quoted by the BBC as follows: "Freedom of speech is the right to tell the truth, not the same as the right to know - it doesn't give them the right to know minute details about people's lives."
I would agree that you and your family have a right to privacy. I'm curious however as to why you believe that you do, but that Mr. Tune or Mr. Giggs (to take two obvious examples), do not.